94 6.5 diesel [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: 94 6.5 diesel


edtexas
02-19-2005, 10:29 PM
can you help get my truck started? truck stalled haven't been able to start it since. it acted like it ran out of fuel. replaced electronic diesel injection. it didnt work. what else could it be?

quantum mechanic
02-19-2005, 10:39 PM
Replaced what?
Does it smoke when you crank it?

edtexas
02-19-2005, 10:51 PM
replaced the pmd. no truck does not smoke when i crank the engine

Texas Diesel Guy
02-19-2005, 10:57 PM
start with fuel supply, crank the engine and have someone open the bleed on top of the fuel filter. Should get good pressure then you know fuel is getting to the pump atleast, or you have a supply problem. After that, try unplugging the optic sensor. Need a scanner to go much further.

edtexas
02-19-2005, 11:04 PM
i checked for fuel flow and it was ok. i jumped the yellow and red wires going to the pmd and it will start but it goes to full throttle. hope i didnt mess anything up.

Texas Diesel Guy
02-19-2005, 11:07 PM
oh *$%# who's idea was that? Don't do that anymore! Well, I guess that means the PMD is atleast getting power...try unplugging the optic sensor. Have you checked the filter for water/dirt, any thing that could have damaged the injection pump? Can you get a scanner plugged in to watch it during cranking?

edtexas
02-19-2005, 11:10 PM
where is the optic sensor located and what does it look like.

Texas Diesel Guy
02-19-2005, 11:16 PM
Its the 6-wire plug on top of the pump.

Texas Diesel Guy
02-19-2005, 11:21 PM
Did you replace the PMD and the wire harness to it? If not did you inspect the old one for burnt pins? Is the PMD in the factory location, on the side of the pump? Did you have any problems with the truck before this happened?

edtexas
02-19-2005, 11:25 PM
i tried unplugging the optic sensor. did not start i changed the filters no water present.
and i dont have a scanner also checked all ground wires i could find.

quantum mechanic
02-19-2005, 11:28 PM
When you unplug the optical it takes twenty cranks to get it to light. Fuel shut off solenoid been tested?

Texas Diesel Guy
02-19-2005, 11:35 PM
If you can make the truck start by jumping wires to the PMD, then you must be getting fuel and power to the pump. So, it sounds like either your not getting a signal telling the PCM when to close the Fuel Solenoid, or the Driver is not getting the signal, or the Fuel Solenoid is not funtioning properly. If you can't get a scanner on it, then you should probably pull the pump off and have it checked out.

edtexas
02-19-2005, 11:40 PM
tried cranking it almost 30 times but did not start.

quantum mechanic
02-20-2005, 12:26 AM
Loosen an injector line, it will probably verify that you are not getting fuel to the injectors from the pump. Are you sure about the ground for the FSD? it won't run without it. It would have started with the optical unplugged if cranked long enough, if the optical was causing the no-start condition. I'm thinking the FSD isn't grounded or the fuel solenoid's shot.

isaac
02-21-2005, 06:34 PM
when you replaced the PMD, did you take out the tiny little 6 pin circuit board inside the 6 pin conncector and put it in the new pmd? it's about 1 inch long by about 1/4 inch or less and is kinda fun to get out w/o a tool for it.

Texas Diesel Guy
02-21-2005, 09:11 PM
They will run without the resistor, but it will eventually set a code.

edtexas
02-23-2005, 10:19 PM
i installed pmd without resistor. it ran for about three miles. did it mess up the new pmd or can i now install the chip and will it run ?

DieselPro
02-23-2005, 10:21 PM
Just put the resistor back and it will be fine

edtexas
02-23-2005, 11:11 PM
i installed the chip. truck still didnt start. i am going to get another pmd i guess. this sad story goes on.

quantum mechanic
02-24-2005, 09:11 AM
Where are you in Texas?

Juancho
02-24-2005, 03:23 PM
That reminds me, I bought a PMD replacement kit from eBay. It was a stanadyne replacement kit that came with PMD, heat transfer pad and a new harness. I never put a resistor in it, and my Burb runs great, and has now for about 4 months. So unless the kit came with a resistor already installed, I would have to disagree with Texas Diesel Guy and say that running without a resistor doesn't make any difference. However, I can not pass emissions, and I think may truck may be over-fueling, and both of those things may have something to do with the missing resistor. Then again I removed the cat and installed a straight pipe, which may have effected my emission somewhat, and I also installed new injectors (with purple plastic rings instead of the typical orange), which maybe contributing to my over-fueling condition.

69camarox
02-24-2005, 09:45 PM
running a pmd with no resistor the computer will revert to as if it were a #1 resistor and reduce fuel acordingly computer only checks resistor value every 50 key starts info from a new stanadyne resistor

edtexas
02-24-2005, 11:05 PM
i live near port lavaca, victoria. the first pmd i bought would not start the truck. the second one started the truck and ran about 3 miles (without the resistor). i found the resistor on the original pmd on pump. installed it in second pmd and it did not work. the dealer will not give me a 3rd pmd unless the dealer installs. the tech wants to install it in the original location (injection pump) and charge me 350 dollars. that cant be right! i thought the idea was to remove it from any source of heat.

quantum mechanic
02-25-2005, 08:20 AM
I'm leaning towards fuel solenoid sticking. It surged when you jumped the FSD pins and won't start other wise.